The Nike ACG Cloud Trekker Full-Zip Jacket is built around four-way stretch fabric and articulated seams, so the jacket moves through a reach or a long stride instead of fighting it. An elongated hood brim and storm flap add coverage in light rain, with bungee adjustment at the hood and hem to dial in the fit as conditions change. A water-repellent finish sheds moisture in wet weather, tested on real high-altitude terrain in Yunnan, China, where thin air and shifting weather demanded both breathability and stretch. What Our Gearhead(R) Experts Are Saying:"I reached overhead scrambling up a rocky section and never felt the jacket pull across my shoulders, which is usually the first place a stiffer shell gives out."